Suggestions for Improving Error Handling in User Input Validation

import { Either as E, Match as M, ParseResult, Schema as S } from 'effect'

export const PrimaryKeyIndex = S.NonNegative.pipe(S.brand('PrimaryKeyIndex'))

export class AccountCreate extends S.Class<AccountCreate>('AccountCreate')({
  name: S.NonEmptyString.pipe(S.minLength(4), S.maxLength(12)),
  state: S.Literal('AAAA', 'BBBB', 'CCCC'),
  apiKey: S.NonEmptyString
}) {
  static readonly decode = S.decodeEither(this, {
    exact: true,
    onExcessProperty: 'error'
  })
  static readonly encode = S.decodeEither(this, {
    exact: true,
    onExcessProperty: 'error'
  })
}

export class AccountModel extends AccountCreate.extend<AccountModel>(
  'AccountModel'
)({
  uid: PrimaryKeyIndex
}) {
  static readonly decode = S.decodeEither(this, {
    exact: true,
    onExcessProperty: 'error'
  })
  static readonly encode = S.decodeEither(this, {
    exact: true,
    onExcessProperty: 'error'
  })
}

const s = AccountCreate.decode({
  name: '1234',
  state: 'AAAA',
  apiKey: 1234
})

if (E.isLeft(s)) {
  const { path } = ParseResult.ArrayFormatter.formatErrorSync(s.left)[0]!
  const cause = M.value(path).pipe(
    M.when(['name'], () => 'name'),
    M.when(['state'], () => 'state'),
    M.when(['apiKey'], () => 'apiKey')
  )
  console.log(`invalid ${cause.value.right}`)
}

import { Either as E, Match as M, ParseResult, Schema as S } from 'effect'

export const PrimaryKeyIndex = S.NonNegative.pipe(S.brand('PrimaryKeyIndex'))

export class AccountCreate extends S.Class<AccountCreate>('AccountCreate')({
  name: S.NonEmptyString.pipe(S.minLength(4), S.maxLength(12)),
  state: S.Literal('AAAA', 'BBBB', 'CCCC'),
  apiKey: S.NonEmptyString
}) {
  static readonly decode = S.decodeEither(this, {
    exact: true,
    onExcessProperty: 'error'
  })
  static readonly encode = S.decodeEither(this, {
    exact: true,
    onExcessProperty: 'error'
  })
}

export class AccountModel extends AccountCreate.extend<AccountModel>(
  'AccountModel'
)({
  uid: PrimaryKeyIndex
}) {
  static readonly decode = S.decodeEither(this, {
    exact: true,
    onExcessProperty: 'error'
  })
  static readonly encode = S.decodeEither(this, {
    exact: true,
    onExcessProperty: 'error'
  })
}

const s = AccountCreate.decode({
  name: '1234',
  state: 'AAAA',
  apiKey: 1234
})

if (E.isLeft(s)) {
  const { path } = ParseResult.ArrayFormatter.formatErrorSync(s.left)[0]!
  const cause = M.value(path).pipe(
    M.when(['name'], () => 'name'),
    M.when(['state'], () => 'state'),
    M.when(['apiKey'], () => 'apiKey')
  )
  console.log(`invalid ${cause.value.right}`)
}